-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=72191

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-- Indicator profile initialization routine
-- Defines indicator profile properties and indicator parameters
-- TODO: Add minimal and maximal value of numeric parameters and default color of the streams
function Init()
    indicator:name("Trend  Strength");
    indicator:description("");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);

  
 	indicator.parameters:addGroup("Calculation");	
    indicator.parameters:addInteger("Period1", "Fast MA", "", 8, 1, 2000);
    indicator.parameters:addInteger("Period2", "Mid MA", "", 40, 1, 2000);
    indicator.parameters:addInteger("Period3", "Slow MA", "", 200, 1, 2000);
	
	
	indicator.parameters:addString("Method", "MA Method", "Method" , "MVA");
    indicator.parameters:addStringAlternative("Method", "MVA", "MVA" , "MVA");
    indicator.parameters:addStringAlternative("Method", "EMA", "EMA" , "EMA");
    indicator.parameters:addStringAlternative("Method", "LWMA", "LWMA" , "LWMA");
    indicator.parameters:addStringAlternative("Method", "TMA", "TMA" , "TMA");
    indicator.parameters:addStringAlternative("Method", "SMMA", "SMMA" , "SMMA");
    indicator.parameters:addStringAlternative("Method", "KAMA", "KAMA" , "KAMA");
    indicator.parameters:addStringAlternative("Method", "VIDYA", "VIDYA" , "VIDYA");
    indicator.parameters:addStringAlternative("Method", "WMA", "WMA" , "WMA");
	
    indicator.parameters:addBoolean("Absolute", "Absolute", "Absolute", true);	
 
	
	 indicator.parameters:addGroup("Line Style");	 
	
	indicator.parameters:addColor("Up", "Up Bar Color", "", core.rgb(0, 255, 0)); 
	indicator.parameters:addColor("Down", "Down Bar Color", "", core.rgb(255, 0, 0)); 
	indicator.parameters:addColor("Neutral", "Neutral Bar Color", "", core.rgb(0, 0, 255)); 
	
    --indicator.parameters:addInteger("width", "Line width", "", 1, 1, 5);
    --indicator.parameters:addInteger("style", "Line style", "", core.LINE_SOLID);
    --indicator.parameters:setFlag("style", core.FLAG_LINE_STYLE);	
end

-- Indicator instance initialization routine
-- Processes indicator parameters and creates output streams
-- TODO: Refine the first period calculation for each of the output streams.
-- TODO: Calculate all constants, create instances all subsequent indicators and load all required libraries
-- Parameters block
 
	
local first;
local source = nil;
local Period1, Period2, Period3,Method; 
local Indicator1,Indicator2, Indicator3;
local Absolute; 	
-- Routine
 function Prepare(nameOnly)   
 
    
	Period1=instance.parameters.Period1;
	Period2=instance.parameters.Period2;
	Period3=instance.parameters.Period3;	
	Method=instance.parameters.Method; 
	Absolute=instance.parameters.Absolute;
	source = instance.source
 
    local name = profile:id() .. "(" ..  instance.source:name().. "," ..  Period1.. "," ..  Period2 .. "," ..  Period3 .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end
	
	Indicator1= core.indicators:create(Method, source, Period1 );
	Indicator2= core.indicators:create(Method, source, Period2 );
	Indicator3= core.indicators:create(Method, source, Period3 );	
	first=math.max(Indicator1.DATA:first(),Indicator2.DATA:first(),Indicator3.DATA:first()) ; 
	
	
 
 
	
	 
    Trend = instance:addStream("Trend", core.Bar, name, "Trend", instance.parameters.Up, first );
    
	Trend:setPrecision(math.max(2, instance.source:getPrecision())); 
    Trend:addLevel(0);	
	
   -- Trend:setWidth(instance.parameters.width);
   --Trend:setStyle(instance.parameters.style);
end


function Update(period, mode)

	Indicator1:update(mode); 
	Indicator2:update(mode); 
	Indicator3:update(mode);
	
	if period <= first then
	return;
	end
	 
   
	
	
	
	
	if Indicator1.DATA[period] >  Indicator2.DATA[period]
	and Indicator2.DATA[period] >  Indicator3.DATA[period]
	then
	Trend:setColor(period,  instance.parameters.Up);
	elseif Indicator1.DATA[period] <  Indicator2.DATA[period]
	and Indicator2.DATA[period] <  Indicator3.DATA[period]
	then	
	Trend:setColor(period,  instance.parameters.Down);	
	else
	Trend:setColor(period,  instance.parameters.Neutral);	
	end
	
	Trend[period]= 
	((Indicator1.DATA[period] -  Indicator2.DATA[period])/source:pipSize())*(Period1/Period2)
	+
	((Indicator2.DATA[period] -  Indicator3.DATA[period])/source:pipSize())*(Period2/Period3);
 
	
	if Absolute then
	Trend[period]=math.abs(Trend[period]);
	end
	
end